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TPS3600D50PWR Datasheet(PDF) 6 Page - Texas Instruments

No. de pieza TPS3600D50PWR
Descripción Electrónicos  BATTERY-BACKUP SUPERVISORS FOR LOW-POWER PROCESSORS
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TPS3600D50PWR Datasheet(HTML) 6 Page - Texas Instruments

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TPS3600D20, TPS3600D25, TPS3600D33, TPS3600D50
BATTERY BACKUP SUPERVISORS FOR LOW POWER PROCESSORS
SLVS336B − DECEMBER 2000 − REVISED JANUARY 2007
6
Terminal Functions
TERMINAL
I/O
DESCRIPTION
NAME
NO.
I/O
DESCRIPTION
BATTOK
9
O
Battery status output
BATTON
6
O
Logic output/external bypass switch driver output
CEIN
5
I
Chip-enable input
CEOUT
10
O
Chip-enable output
GND
3
I
Ground
MR
11
I
Manual reset input
MSWITCH
4
I
Manual switch to force device into battery-backup mode (connect to GND if not used)
PFI
7
I
Power-fail comparator input (connect to GND if not used)
PFO
8
O
Power-fail comparator output
RESET
13
O
Active-low reset output
VBAT
14
I
Backup-battery input
VDD
2
I
Input supply voltage
VOUT
1
O
Supply output
WDI
12
I
Watchdog timer input
detailed description
battery freshness seal
The battery freshness seal of the TPS3600 family disconnects the backup battery from the internal circuitry until
it is needed. This ensures that the backup battery connected to VBAT should be fresh when the final product is
put to use. The following steps explain how to enable the freshness seal mode:
1.
Connect VBAT (VBAT > VBAT(min))
2.
Ground PFO
3.
Connect PFI to VDD or PFI > V(PFI)
4.
Connect VDD to power supply (VDD > VIT)
5.
Ground MR
6.
Power down VDD
7.
The freshness seal mode is entered and pins PFO and MR can be disconnected.
The battery freshness seal mode is disabled by the positive-going edge of RESET when VDD is applied.
BATTOK output
This is a logic feedback of the device to indicate the status of the backup battery. The supervisor checks the
battery voltage every 200 ms with a voltage divider load of approximately 100 K
Ω and a measure cycle on-time
of 25
µs. This measurement cycle starts after the reset is released. If the battery voltage VBAT is below the
negative-going threshold voltage V(BOK), the indicator BATTOK does a high-to-low transition. Otherwise, its
status remains to the VOUT level.
Table 1. Typical Values for BATTOK Indication
SUPERVISOR TYPE
VIT TYP
VBOK MIN
VBOK TYP
VBOK MAX
TPS3600D20
1.78 V
1.84 V
1.91 V
1.97 V
TPS3600D25
2.22 V
2.3 V
2.38 V
2.46 V
TPS3600D33
2.93 V
3.04 V
3.14 V
3.24 V
TPS3600D50
4.40 V
4.56 V
4.71 V
4.86 V
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